| sleekness | (noun) the smooth feel of silk fabric | Synonyms: silkiness |
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| (noun) the quality of being well-groomed and neatly tailored | - |
| sleep | (noun) a natural and periodic state of rest during which consciousness of the world is suspended | Synonyms: slumber |
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| (noun) euphemisms for death (based on an analogy between lying in a bed and in a tomb) | Synonyms: eternal rest, eternal sleep, quietus, rest |
| (noun) a torpid state resembling deep sleep | Synonyms: sopor |
| (noun) a period of time spent sleeping | Synonyms: nap |
| sleeper | (noun) an unexpected hit | - |
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| (noun) tropical fish that resembles a goby and rests quietly on the bottom in shallow water | Synonyms: sleeper goby |
| (noun) a passenger car that has berths for sleeping | Synonyms: sleeping car, wagon-lit |
| (noun) one of the cross braces that support the rails on a railway track | Synonyms: crosstie, railroad tie, tie |
| (noun) a piece of furniture that can be opened up into a bed | - |
| (noun) pajamas with feet; worn by children | - |
| (noun) a rester who is sleeping | Synonyms: slumberer |
| (noun) an unexpected achiever of success | - |
| (noun) a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal | - |
| sleepiness | (noun) a very sleepy state | Synonyms: drowsiness, somnolence |
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| sleeping | (noun) the suspension of consciousness and decrease in metabolic rate | - |
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| (noun) quiet and inactive restfulness | Synonyms: dormancy, quiescence, quiescency |
| (noun) the state of being asleep | - |
| sleeplessness | (noun) a temporary state in which you are unable (or unwilling) to sleep | Synonyms: wakefulness |
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| sleepover | (noun) an occasion of spending a night away from home or having a guest spend the night in your home (especially as a party for children) | - |
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| sleepwalker | (noun) someone who walks about in their sleep | Synonyms: noctambulist, somnambulist |
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| sleepwalking | (noun) walking by a person who is asleep | Synonyms: noctambulation, noctambulism, somnambulation, somnambulism |
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| sleepwear | (noun) garments designed to be worn in bed | Synonyms: nightclothes, nightwear |
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| sleepyhead | (noun) a sleepy person | - |
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| sleet | (noun) partially melted snow (or a mixture of rain and snow) | - |
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| sleeve | (noun) the part of a garment that is attached at the armhole and that provides a cloth covering for the arm | Synonyms: arm |
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| (noun) small case into which an object fits | - |